Tool modification to prevent inadvertent release of tool attachments
A tool having a collar disposed rearward of a movable sleeve or tool attachment so as to deflect objects away from the rearward edge of the sleeve or tool attachment when in the tool attachment lock position thereby preventing inadvertent release of the tool attachment during use.
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Quick change tool bit holders, ratchet extensions and other tools adapted for holding or attaching interchangeable sockets, drivers, tool bits, etc. are well known in the art. While these various tools may serve their intended purpose, the sockets, drivers, tool bits or other attachments can be inadvertently released. Accordingly, there is a need for a relatively simple and inexpensive after market fix to prevent the inadvertent release of such tool attachments. There is also a need for a simple inexpensive solution that can be incorporated by an original equipment manufacturer to modify their existing tools to prevent the inadvertently release of such attachments.
Referring now to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views,
A sleeve 22 is movable fore and aft with respect to the shaft 16 between a tool attachment release position (
It has been found that with the type of quick change tool holders illustrated in
To prevent objects from catching on the rearward edge 32 of the sleeve 22, a collar 40 as illustrated in
The outer periphery of the collar 40 is preferably sloped, chamfered or radiused to provide a smooth transition between the shaft 16 and the sleeve 22 to better deflect objects away from the sleeve. Also, it is preferable that at least a portion of the outer periphery of the collar 40 is at least about as great as the outer periphery of the sleeve 22 so that objects cannot catch on the rearward edge 32 of the sleeve forcing it forward resulting in inadvertent release or false ejection of the tool attachment 12.
In one embodiment, the collar 40 is preferably press fit onto the shaft 16. In such an embodiment, the interior diameter of the collar 40 is preferably the same as or slightly smaller than the outside diameter of the shaft 16. To assist in press fitting the collar 40 to the shaft 16, a press tube 50 may be utilized. The press tube 50 includes an axial bore 52. The forward end of the bore 52 is preferably countersunk to provide an interior periphery 54 that is complimentary to the exterior periphery of the collar 40 such that the collar 40 will preferably seat flush with the forward end of the press tube 50. In use, the shank end of the tool 10 is inserted through the collar 40 and into the bore 52 of press tube 50. The end of the press tube 50 is then forced downwardly, preferably by a hydraulic press or by pounding, until the collar 40 is secured to the shaft 16 at the proper location. To ensure that the collar is secured at the proper location, it is preferable to move the sleeve 22 to the tool attachment lock position prior to press fitting the collar 40 in place. The collar 40 will be properly placed when the forward face 42 of the collar 40 contacts the rearward edge 32 of the sleeve 22 when the sleeve 22 is in the tool attachment lock position. To ensure that the collar 40 is not accidentally pressed too far onto the shaft 16, the depth of the bore 52 is preferably the same as the distance from the rearward most end of the shank 14 to the rearward edge of the sleeve when in the tool attachment lock position. Thus, when the bottom of the bore 52 abuts the rearward most end of the shank 14, the collar 40 is properly positioned.
It should be appreciated that instead of a press fit, the collar 40 may be bonded to the shaft 16 such as by welding or an adhesive. Alternatively, the collar 40 may be formed integral with the shaft 16 during the original manufacture of the shaft.
It should also be appreciated that although the outer periphery of the shaft 16 and collar 40 are illustrated as being cylindrical, the outer peripheries may be any suitable size and complimentary shape.
As in the previous embodiment, a press tube 50 may be provided to assist in press fitting the collar 40 onto the shaft 16 of the tool 10 at the proper location. Also as in the previous embodiments, it should be appreciated that instead of a press fit, the collar 40 may be bonded to the shaft 16 such as by welding or an adhesive. Alternatively, the collar 40 may be formed integral with the shaft 16 during the original manufacture of the shaft. It should also be appreciated that although the outer periphery of the shaft 16 and collar 40 are illustrated as being cylindrical, the outer peripheries may be any suitable size and complimentary shape.
As in the previous embodiment, a press tube 50 may be provided to assist in press fitting the collar 40 onto the shaft 16 of the tool 10 at the proper location. Also as in the previous embodiments, it should be appreciated that instead of a press fit, the collar 40 may be bonded to the shaft 16 such as by welding or an adhesive. Alternatively, the collar 40 may be formed integral with the shaft 16 during the original manufacture of the shaft. It should also be appreciated that although the outer periphery of the shaft 16 and collar 40 are illustrated as being cylindrical, the outer peripheries may be any suitable size and complimentary shape.
The foregoing description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements. Various modifications to the preferred embodiment of the apparatus, and the general principles and features of the system and methods described herein will be readily apparent to those of skill in the art. Thus, the present invention is not to be limited to the embodiments of the apparatus, system and methods described above and illustrated in the drawing figures, but is to be accorded the widest scope consistent with the spirit and scope of the appended claims.
Claims
1. A tool for interchangeable tool attachments, the tool comprising:
- a tool shaft having a tool attachment end for receiving the tool attachment;
- a sleeve movable with respect to the tool shaft between a tool attachment lock position and a tool attachment release position, wherein in the tool attachment lock position, the sleeve is moved in a direction opposite the tool attachment end, and wherein in the tool attachment release position the sleeve is moved in a direction toward the tool attachment end, the sleeve having a rearward edge and an outer periphery greater than an outer periphery of the tool shaft;
- a collar having a forward end and an outer peripheral portion at least about as great as the sleeve outer periphery, the collar disposed rearward of the movable sleeve wherein the collar forward end is in close proximity to the sleeve rearward end when in the tool attachment lock position so as to deflect objects away from the rearward edge of the sleeve when in the tool attachment lock position thereby preventing inadvertent release of the tool attachment during use.
2. The tool of claim 1 wherein the collar is press-fit to the tool shaft.
3. The tool of claim 1 wherein the collar is formed integral with the tool shaft.
4. The tool of claim 1 wherein the collar is bonded to the tool shaft.
5. The tool of claim 1 wherein the tool attachment is a reversible driver.
6. The tool of claim 1 wherein the tool attachment is a driver.
7. The tool of claim 1 wherein the tool attachment is a socket.
8. A tool for interchangeable tool attachments, the tool comprising:
- a tool shaft having a tool attachment end for receiving the tool attachment, the tool attachment movable with respect to the tool shaft between a tool attachment lock position and a tool attachment release position, wherein in the tool attachment lock position, the tool attachment is moved in a direction opposite the tool attachment end, and wherein in the tool attachment release position the tool attachment is moved in a direction toward the tool attachment end, the tool attachment having a rearward edge and an outer periphery greater than an outer periphery of the tool shaft;
- a collar having a forward end and an outer peripheral portion at least about as great as the tool attachment outer periphery, the collar forward end disposed in close proximity to the tool attachment rearward end when in the tool attachment lock position so as to deflect objects away from the rearward edge of the sleeve when in the tool attachment lock position thereby preventing inadvertent release of the tool attachment during use.
9. The tool of claim 8 wherein the collar is press-fit to the tool shaft.
10. The tool of claim 8 wherein the collar is formed integral with the tool shaft.
11. The tool of claim 8 wherein the collar is bonded to the tool shaft.
12. The tool of claim 8 wherein the tool attachment is a reversible driver.
13. The tool of claim 8 wherein the tool attachment is a driver.
14. The tool of claim 8 wherein the tool attachment is a socket.
15. A method of modifying a tool to prevent inadvertent release of a tool attachment, the method comprising:
- a) providing a tool having a shaft with a bore at one end for receiving the tool attachment, the tool further having a sleeve movable with respect to the shaft between a tool attachment lock position and a tool attachment release position, wherein in the tool attachment lock position, the sleeve is moved in a direction opposite the bore end to lock the tool attachment within the bore end, and wherein in the tool attachment release position the sleeve is moved in a direction toward the bore end to release the tool attachment, the sleeve having a rearward edge and an outer periphery greater than an outer periphery of the shaft;
- b) providing a collar having a forward end and an outer peripheral portion at least about as great as the outer periphery of the sleeve;
- c) securing the collar to the shaft rearward of the movable sleeve such that the collar forward end is disposed in close proximity to the sleeve rearward edge when in the tool attachment lock position so as to deflect objects away from the rearward edge of the sleeve when in the tool attachment lock position thereby preventing inadvertent release of the tool attachment during use.
16. The method of claim 15 wherein the step of securing the collar includes press-fitting the collar to the shaft.
17. The method of claim 15 wherein the step of securing the collar includes forming the collar integral with the shaft.
18. The method of claim 15 wherein the step of securing the collar includes bonding the collar to the shaft.
19. A method of modifying a tool to prevent inadvertent release of a tool attachment, the method comprising:
- (a) providing a tool having a shaft, the shaft having a tool attachment end for receiving the tool attachment, the tool attachment movable with respect to the tool shaft between a tool attachment lock position and a tool attachment release position, wherein in the tool attachment lock position, the tool attachment is moved in a direction opposite the tool attachment end, and wherein in the tool attachment release position the tool attachment is moved in a direction toward the tool attachment end, the tool attachment having a rearward edge and an outer periphery greater than an outer periphery of the tool shaft;
- (b) providing a collar having a forward end and an outer peripheral portion at least about as great as the outer periphery of the tool attachment;
- (c) securing the collar to the tool shaft such that the collar forward end is disposed in close proximity to the tool attachment rearward edge when in the tool attachment lock position so as to deflect objects away from the rearward edge of the tool attachment when in the tool attachment lock position thereby preventing inadvertent release of the tool attachment during use.
20. The method of claim 19 wherein the step of securing the collar includes press-fitting the collar to the shaft.
21. The method of claim 19 wherein the step of securing the collar includes forming the collar integral with the shaft.
22. The method of claim 19 wherein the step of securing the collar includes bonding the collar to the shaft.
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Type: Grant
Filed: Feb 14, 2011
Date of Patent: Dec 17, 2013
Patent Publication Number: 20120204685
Assignee: (Elmood, WI)
Inventor: James B. Marson (Elmwood, WI)
Primary Examiner: Lee D Wilson
Assistant Examiner: Shantese McDonald
Application Number: 13/026,420
International Classification: B24B 13/00 (20060101);